the fbi investigated -- air force base in tampa. the phish investigat -- the fbi investigated and now lawmakers are demanding more information. >> reporter: the fbi never gave anyone in congress a heads up david petraeus was the center of an investigation and the chairwoman plans an investigation of her own to find out why. senator feinstein also revealed that the petraeus broadwell affair came to light while the bureau was trying to figure out who was harassing another female friend of petraeus over e-mail. >> what i've been told is that there was somebody else that he knew and was close to and that mrs. broadwell sent these threatening e-mails to her and she was frightened and she went to the fbi. >> reporter: petraeus is no longer expected to testify before congress about the deadly 9/11 raid on the u.s. consulate in benghazi, but republican senator lindsey graham says the truth will never come out if petraeus keeps quiet forever. >> we have a national security failure along in the making. i don't see how in the world you can fin